Device Not Connected on iPad – Pioneer ARC Review

I use an iPad in my car. (Apple CarPlay just isn't worth bothering with yet.) I bought a Pioneer radio thinking I'd be able to mount the radio (Pioneer DEH-8800BHS) and control it thru the app without having to move the iPad to access certain basic features. The app runs on the iPad but it says "Device not connected" and therefore can not control things like volume, tuner, equalizer- only iPod functions which is useless. (I realize this app is designed only for iPhone but I found no other way to contact the developer with suggestions)
Review by dkbwil on Pioneer ARC.